<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 引入 vue.js 文件 -->
    <script src="../js/vue.js"></script>
    <style>
        .active {
            color: red;
        }
    </style>
</head>

<body>
    <div id="app">
        <h2 :class="['active','link']">{{message}}</h2>
        <button @click="btn">按钮</button>
    </div>
    <script>
        new Vue({
            el: "#app",
            data: {
                message: "Hello Vue",
                isActive: true,
                isLine: false
            },
            methods: {
                btn: function () {
                    this.isActive = !this.isActive;
                }
            }
        });
    </script>
</body>

</html>